Nanometer zirconia powder and synthesis method thereof

Abstract

The invention aims to provide nanometer zirconia powder and a synthesis method thereof. The nanometer zirconia powder is high in crystallinity degree, slight in agglomeration, small in grain size, narrow in distribution and large in specific area. The nanometer zirconia powder is prepared from, by weight, 96.5-97% of ZrO2 and 3-3.5% of Y2O3. The synthesis method for the nanometer zirconia powder comprises the following sequentially-executed steps of preparing a zirconium compound and a yttrium oxide solution; preparing an oxalic acid solution; carrying out filtering; carrying out a precipitation reaction; carrying out a thermal decomposition reaction after washing and drying; carrying out wet grinding; carrying out a supercritical hydrothermal reaction. The synthesis method is applied to the technical field of synthesis of the nanometer zirconia powder.

Description

technical field [0001] The invention relates to a nano zirconia powder, in particular to a nano zirconia powder used in the preparation of precision knives and scalpels and a synthesis method of the nano zirconia powder. Background technique [0002] The commonly used zirconia powder is yttria-stabilized zirconia, which has excellent physical, chemical and material process characteristics when applied to the preparation of precision knives and scalpels. At present, there are many methods for preparing zirconia powder, such as precipitation method, sol-gel method, metal alkoxide hydrolysis method, microemulsion method, conventional hydrothermal method, etc. Among them, precipitation method, sol-gel method, hydrolysis method and microemulsion method Generally, they have to be calcined at high temperature, which leads to very serious agglomeration and abnormal growth of powder particles. Although this phenomenon can be effectively alleviated by lowering the calcination temperat...

AI Technical Summary

Problems solved by technology

At present, there are many methods for preparing zirconia powder, such as precipitation method, sol-gel method, metal alkoxide hydrolysis method, microemulsion method, conventional hydrothermal method, etc. Among them, precipitation method, sol-gel method, hydrolysis method and microemulsion method Generally, they have to be calcined at high temperature, which leads to very serious agglomeration and abnormal growth of powder particles. Although this phenomenon can be effectively alleviated by lowering the calcination temperature, it will lead to the problem of low crystallinity. The body is used in the preparation of precision knives and scalpels, which will seriously affect the mechanical strength and sharpness of the knives. Especially the scalpel belongs to the field of medical devices. Due to its special industry standards and uses, the safety and reliability of the scalpel cannot be guaranteed. and validity

The conventional hydrothermal method requires a long reaction time, and it is difficult to avoid the problem of grain growth.

However, when directly using zirconium compound solution or zirconium hydroxide as raw materials for supercritical hydrothermal synthesis, due to the high reactivity of such raw materials, in order to obtain nano-products, a very short reaction time is required, which is difficult to realize and control in industry